Bar stool



FIG. 1 is a left-front perspective view of a bar stool showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top view thereof. 

The ornamental design for a bar stool, as shown and described. 